copy core from metabalus

src/synth/NoteQueue.hpp

@@ -1,2 +1,39 @@
 
 // the note queue is a wrapper for a FIFO array to which the midi/keyboard controller enters note events into and the synthesizer consumes from
+#pragma once
+
+#include <array>
+#include <atomic>
+#include <cstdint>
+#include <chrono>
+
+#define SYNTH_NOTE_QUEUE_SIZE 128
+
+enum class NoteEventType {
+    NoteOn,
+    NoteOff
+};
+
+struct NoteEvent {
+    NoteEventType type; // noteOn or noteOff
+    uint8_t note; // 0-128, a keyboard goes 0-87
+    float velocity; // 0-1, from a midi instrument its 0-127 though
+    std::chrono::time_point<std::chrono::high_resolution_clock> timestamp;
+};
+
+class NoteQueue {
+
+public:
+    NoteQueue() = default;
+    ~NoteQueue() = default;
+
+    bool push(const NoteEvent& event);
+    bool pop(NoteEvent& event);
+
+private:
+    
+    std::array<NoteEvent, SYNTH_NOTE_QUEUE_SIZE> buffer_;
+    std::atomic<size_t> head_{ 0 };
+    std::atomic<size_t> tail_{ 0 };
+
+};